diff options
Diffstat (limited to 'internal/syscallcompat/sys_linux.go')
| -rw-r--r-- | internal/syscallcompat/sys_linux.go | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/internal/syscallcompat/sys_linux.go b/internal/syscallcompat/sys_linux.go index 5c180ec..595aa1d 100644 --- a/internal/syscallcompat/sys_linux.go +++ b/internal/syscallcompat/sys_linux.go @@ -3,6 +3,7 @@ package syscallcompat import ( "fmt" + "runtime" "sync" "syscall" @@ -75,6 +76,28 @@ func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) return syscall.Openat(dirfd, path, flags, mode) } +// OpenatUser runs the Openat syscall in the context of a different user. +func OpenatUser(dirfd int, path string, flags int, mode uint32, context *fuse.Context) (fd int, err error) { + if context != nil { + runtime.LockOSThread() + defer runtime.UnlockOSThread() + + err = syscall.Setregid(-1, int(context.Owner.Gid)) + if err != nil { + return -1, err + } + defer syscall.Setregid(-1, 0) + + err = syscall.Setreuid(-1, int(context.Owner.Uid)) + if err != nil { + return -1, err + } + defer syscall.Setreuid(-1, 0) + } + + return Openat(dirfd, path, flags, mode) +} + // Renameat wraps the Renameat syscall. func Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) { return syscall.Renameat(olddirfd, oldpath, newdirfd, newpath) |